Lawyers must excercise diligence to protect the confidentiality of privileged client materials. Lawyers who mistakenly press the "send" button on their computers or "reply to all" may find that they inadvertently disclosed confidential material to adversaries -- or the public. The recipient of such inadvertently sent confidential materials may have a duty to alert an adversary to the mistaken disclosure, depending on the precautions taken to preserve privilege, and whether there is evidence of a conscious or reckless waiver of the privilege.